Back support



FIG. 1 is a perspective view of a back support according to anembodiment;

FIG. 2 is a right side view of the back support of FIG. 1 ;

FIG. 3 is a left side view of the back support of FIG. 1 ;

FIG. 4 is a front view of the back support of FIG. 1 ;

FIG. 5 is a rear view of the back support of FIG. 1 ;

FIG. 6 is a top view of the back support of FIG. 1 ; and,

FIG. 7 is a bottom view of the back support of FIG. 1 .

The broken lines show portions of the article not claimed and form nopart of the claimed design.

CLAIM The ornamental design for a back support, as shown and described.